Dynamo-electric machine



(No Model.) 7 3 Sheets-Sheet 1. J. E. MAYNADIER. DYNAMO ELEOTRIG MACHINE.

(No Model.) 3 SheetsSheet 2. J. E. MAYNADIER.

(No Model.) a sheets-sheet 3.

J. E. MAYNADIER. DYNAMO ELECTRIC MACHINE.

No. 515,882. Patented Mar. 6, 1894.

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JAMES IIVELETI-I MAYNADIER, OF TAUNTON, BIASSAOHUSETTS.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 515,882, dated March 6, 1894.

Application filed August 30, 1893. Serial No. 484,346. (No model) To aZZ whom it may concern.-

Be it known that I, JAMES EVELETH MAY- NADIER, of Taunton, in the county of Bristol and State of Massachusetts, have invented a new and useful Dynamo, of which the followmg is a specification, reference being had to the accompanying drawings, in which Figure l is a plan of one of my dynamos; Fig. 2 a section on line 2-2 of Fig. 3; Fig. an end elevation. Fig. at is an end elevation; and Fig. 5 a section on line 55 of Fig. 4, illustrating a modification. Fig. 6 is a sectional detail.

The main feature of my invention is a novel arrangement of conducting rings, insulated from but revolving with their shafts, and connected electrically in series, so that one ring conductor is connected electrically by one of its edges with a second ring conductor on the same shaft, and by its other edge with a third ring conductor on another shaft. This new principle enables me to use a large number of conductors in series as arinatures in a dynamo or motor; each ring conductor being one of a pair, on different shafts, and also one of a pair on the same shaft.

In the drawings, the cores of the field magnets are marked A and the pole pieces B; an N pole piece being opposed to an S pole piece, and each pole piece being energized by cores A. I have shown the intermediate pole pieces B and cores A as twice as large as the end pole pieces and end cores. The cores A are bridged by slabs of iron D, and held together by rods H and nuts 7L between end pieces G of non magnetic material. These end pieces G support shaft F upon which are secured insulators K which carry the generating conductors or rings M, with a flange, m, to afford a wider bearing for the collectors, 71 which are in contact with the outer periphery of the flanges m.

The adjusting devices J are desirable in order that the air gap between the pole pieces may be made as narrow as possible, and yet have the ring M run in it without contact with the pole pieces. Rings m of hard rubher or other insulator are desirable on rings M, to prevent accidental contact between the generating conductor M and the pole pieces,

B, as shown in Fig. 6.

Each generating conductor or ring armature, M, generates a certain electro-mot-ive force, with a certain speed and strength of field, and in order that the rings M may be in series, the first and second are connected by hoop 7t on the insulator K, and so of the third and fourth; fifth and sixth, and so on. But the second and third are connected by the collectors, it, one set of which are in contact with the flanges, m, of the second and third armatures; a second set with the flanges of the fourth and fifth, and so on. When the surface speed of the flanges, m, is very great, the collectors, 22, should move in the same direction to diminish friction, and for that reason I have shown'the collectors, n, as belts, with their pulleys mounted on a shaft shown in Figs. 1 and 3, the same as the armatures are mounted on the armature shaft, except that the armatures are connected the first with the second; the third with the fourth; the fifth with the sixth, and so on; ,while the pulleys are connected the second with the third; the fourth with the fifth; the sixth with the seventh and so on.

In that form of my machine shown in Figs. 2, and 3, the circuit is through the outer pulley, (which is electrically connected with its hub 91 to the outer armature, through a belt collector; through the outer armature to the second armature; through that second armature by a belt collector to the second pulley; through that second pulley to the third pulley; through that third pulley to the third armature by a belt collector; and so on; the first and second armatures being electrically connected by hoop 7c, and the second and third armatures being electrically connected by the belt collectors n, and'by the second and third pulleys. The result is that starting with one of the brushes the circuit is through the hub and its pulley, to the first armature bya belt collector; through the first armature to the second armature; through the second armature to the second pulley by a belt collector; through the second pulley to the third pulley; through the third pulley to the third armature by a belt collector; and so on, the last armature being connected by a belt collector to the last pulley and its hub. For simplicity I have indicated only one set of brushes, but more will be used if it be desired to make the internal resistance trifling, which is one of the advantages of my machine. I have also shown only two cores for each ring B, but obviously more may be used; but myinvention has nothing to do with constructional details.

Figs. 4 and 5 illustrate by two views aform of my invention somewhat different from that shown in Figs. 1, 2, and 3; the chief difference being that the machine shown in Figs. 4 and 5, is a double machine, the hubs n for the brushes n being on one machine so that no brushes are needed on the other. The belt collectors n, are crossed to give greater contact with the armatures; but obviously will not be crossed if the poles Nand S of either machine be changed to S and N respectively. It will also be clear that the pole pieces B serve simply to concentrate the field of force in the form of a cylinder, and that if suitably shaped magnets be arranged radially about the ring M to form a cylindrical air gap, the result is the same in kind whether pole pieces be used or not.

I have spoken of the ring M as a ring armature but it will be obvious that spokes radiating from a hub, 01' a wheel armature, is included in the term ring armature, if the spokes cut across the cylindrical field of force. The field magnets in large machines are electro-magnets, but may be permanent magnets in small machines- The ring armatures are conducting rings in a motor and also in a dynamo,'but in a dynamo they serve as generators in a somewhat diiferent sense than in a motor, for in a motor they generate counter electro motive force; and for clearness I speak in the claims of ring conductors, meaning to include ring armatures whether generators as in a dynamo, or as in a motor, for in both the rings are conductors; moreover in Figs. 1, 2, and 3 the rings on one shaft are simply conductors.

What I claim as my invention is- 1. In combination a plurality of shafts and a plurality of ring conductors connected electrically in series by connecting one edge of one ring conductor with a second ring conductor on the same shaft, and the other edge with a third ring conductor on another shaft; substantially as described. 5

2. A dynamo comprising a plurality of field magnets; a plurality of shafts; a plurality of ring conductors; belt conductors connecting one edge of each ring conductor on one shaft with a ring conductor on the other shaft; and 55 conductors connecting'the other edge of each ring conductor with a ring conductor on the same shaft; all substantially as described. JAMES EVELETH MAYNADIER. Witnesses:

JONATHAN CILLEY, JOHN R. SNOW. 

